echolocation calls at 45-50kHz, delivered like a machine gun firing short bursts.

Lookalikes: Whiskered Bat Myotis mystacinus, which has a black nose.

Habitat: Humid underground sites such as under bridges, in tunnels, caves (abandoned limestone quarries), cellars, moated chateaux. In the winter they hide in crevices. They eat insects such as mosquitoes, crane flies, moths and even sometimes crustaceans.